engleski

Compressional behaviour of nonwoven fabrics

Nonwoven fabrics are used in a number of technical applications since they have versatile physical‐mechanical properties. The compressional and recovery behaviour is an important mechanical property which could predict nonwoven fabrics behaviour in real use. The tested samples are produced of polypropylene fibres by mechanical carding process and bonded by needle punching (mass per unit area was in range from 155 g m‐2 to 470 g m‐2), nonwoven fabric of polypropylene fibres produced by mechanical carding process, bonded by needling and calendaring process (in range of 200 g m‐2 to 480 g m‐2), following by nonwoven fabric of polyester fibres and produced by carding process, bonded by thermal process (in range of 275 g m‐2 to 525 g m‐2). Samples produced from regenerated (270 g m‐2) and coconut fibres (980 g m‐2) by mechanical carding process and bonded by needle punching as well as moulded polyurethane foam (180 g m‐ 2) were tested. Compressional properties of the nonwoven fabrics are determined using Hess Thickness Gauge. Using Thickness Gauge, onwoven fabrics thickness according to standard ISO 9073‐2:1995 (under pressures of 0.1 and 0.5 kPa) was determined.Additionally, compression study by increasing pressures (from 0 kPa, 0.5 kPa, 1.0 kPa to 49.5 kPa) and then decreasing (from 49.5 kPa, 1.0 kPa, 0.5 kPa to 0 kPa) different nonwoven fabrics compression and recovery values as well as compressional curves were obtained and valuated. A comparative study on the compressional behaviour of different nonwoven fabrics was reported. The ompressibility of needle punched nonwoven fabrics is higher than needle punched and calendared nonwoven fabrics. The polyester nonwoven fabric produced by carding process and bonded by thermal process shows greatest compressibility.

Nonwoven fabrics, thickness, compressibility, thickness loss

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